Composition of matter for the eradication of stains.



pounds, by weig t; su

proportion stated, viz:

UNITED STATES PATENT OFFICE.

LOUIS VON GRAEVE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO CHARLES BUOHERER AND HEINRICH SCHRODER, OF PHILADELPHIA,

PENNSYLVANIA.

Specification of Letters Patent.

Patented Jan. 8, 1907.

Application filed April 23,1906. Serial No- 313,178.

To all whom it may concern.-

Be it known that I, LOUIS VON GRAEVE, a

- citizen of the United States, residin at Phila delphia, in the county of Philade phia and State of Pennsylvania, have invented a new and useful Composition of Matter to be Used for the Eradication of Stains and Thorough Cleansing of Marble and Granite and Similar Minerals, of which the following is a specification.

My composition consists of the following ingredients, combined, substantially, in the oxalic acid, two French chalk, two drochloric acid, two furic acid, one 'ound, y weight; pure water, five pints, fiui meas- These ingredients are mixed in the followin manner: The oxalic acid is first dissolve in the Water, to which is then added the French chalk, and, after mixing thorou hly, the acids.

in using the above composition it should be thoroughly agitated and applied by an asbestos brush to the stone requiring treatment.

Theproperties of oxalic acid in removing stains and discolorations are well known; but in order to obtain chemically clean and ractically renewed surfaces it is not in itse f entirely eflicacious. The other acids in comounces, by weight; pounds, by wei ht; h

bination do, however, eflect a thorough re-. newal, assisted by the scarifying action of the brush, so that when the composition is removed by rinsing co iously with fresh water the appearance 0 the stones treated is as When new.

The object of the French chalk is to hold the acids briefly in suspension, so that unnecessary Waste may not occur.

What I claim as new, and desire to secure by Letters Patent, is-

1. The herein-described compositions of matter, consisting of oxalic, hydrochloric and sulfuric acids, French chalk and water, substantially as described and for the purpose specified.

2. The herein-described com osition of matter for the cleansing of mar le, granite and the like, consisting of oxalic acid, tWo ounces, French chalk two pounds, water five pints, hydrochloric acid two pounds, and sulfuric acid one pound, substantially as described.

In testimony whereof I have signed my name to this application in the presence of two subscribing Witnesses.

LOUIS VON GRAEVE.

Witnesses C. A. KELLY, I. H. KARPER. 

